/*
  Copyright (C) 1997-2011 Sam Lantinga <slouken@libsdl.org>

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely.
*/

/* Test out the multi-threaded event handling functions */

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include "SDL.h"
#include "SDL_thread.h"

/* Are we done yet? */
static int done = 0;

/* Is the cursor visible? */
static int visible = 1;

/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
static void
quit(int rc)
{
    SDL_Quit();
    exit(rc);
}

SDL_Surface *
LoadIconSurface(char *file, Uint8 ** maskp)
{
    SDL_Surface *icon;
    Uint8 *pixels;
    Uint8 *mask;
    int mlen, i;

    *maskp = NULL;

    /* Load the icon surface */
    icon = SDL_LoadBMP(file);
    if (icon == NULL) {
        fprintf(stderr, "Couldn't load %s: %s\n", file, SDL_GetError());
        return (NULL);
    }

    /* Check width and height */
    if ((icon->w % 8) != 0) {
        fprintf(stderr, "Icon width must be a multiple of 8!\n");
        SDL_FreeSurface(icon);
        return (NULL);
    }
    if (icon->format->palette == NULL) {
        fprintf(stderr, "Icon must have a palette!\n");
        SDL_FreeSurface(icon);
        return (NULL);
    }

    /* Set the colorkey */
    SDL_SetColorKey(icon, SDL_SRCCOLORKEY, *((Uint8 *) icon->pixels));

    /* Create the mask */
    pixels = (Uint8 *) icon->pixels;
    printf("Transparent pixel: (%d,%d,%d)\n",
           icon->format->palette->colors[*pixels].r,
           icon->format->palette->colors[*pixels].g,
           icon->format->palette->colors[*pixels].b);
    mlen = icon->w * icon->h;
    mask = (Uint8 *) malloc(mlen / 8);
    if (mask == NULL) {
        fprintf(stderr, "Out of memory!\n");
        SDL_FreeSurface(icon);
        return (NULL);
    }
    memset(mask, 0, mlen / 8);
    for (i = 0; i < mlen;) {
        if (pixels[i] != *pixels)
            mask[i / 8] |= 0x01;
        ++i;
        if ((i % 8) != 0)
            mask[i / 8] <<= 1;
    }
    *maskp = mask;
    return (icon);
}

int SDLCALL
FilterEvents(void *userdata, SDL_Event * event)
{
    static int reallyquit = 0;

    switch (event->type) {

    case SDL_ACTIVEEVENT:
        /* See what happened */
        printf("App %s ", event->active.gain ? "gained" : "lost");
        if (event->active.state & SDL_APPACTIVE)
            printf("active ");
        if (event->active.state & SDL_APPMOUSEFOCUS)
            printf("mouse ");
        if (event->active.state & SDL_APPINPUTFOCUS)
            printf("input ");
        printf("focus\n");

        /* See if we are iconified or restored */
        if (event->active.state & SDL_APPACTIVE) {
            printf("App has been %s\n",
                   event->active.gain ? "restored" : "iconified");
        }
        return (0);

        /* This is important!  Queue it if we want to quit. */
    case SDL_QUIT:
        if (!reallyquit) {
            reallyquit = 1;
            printf("Quit requested\n");
            return (0);
        }
        printf("Quit demanded\n");
        return (1);

        /* Mouse and keyboard events go to threads */
    case SDL_MOUSEMOTION:
    case SDL_MOUSEBUTTONDOWN:
    case SDL_MOUSEBUTTONUP:
    case SDL_KEYDOWN:
    case SDL_KEYUP:
        return (1);

        /* Drop all other events */
    default:
        return (0);
    }
}

int SDLCALL
HandleMouse(void *unused)
{
    SDL_Event events[10];
    int i, found;

    /* Handle mouse events here */
    while (!done) {
        found = SDL_PeepEvents(events, 10, SDL_GETEVENT, SDL_MOUSEMOTION, SDL_MOUSEBUTTONUP);
        for (i = 0; i < found; ++i) {
            switch (events[i].type) {
                /* We want to toggle visibility on buttonpress */
            case SDL_MOUSEBUTTONDOWN:
            case SDL_MOUSEBUTTONUP:
                if (events[i].button.state == SDL_PRESSED) {
                    visible = !visible;
                    SDL_ShowCursor(visible);
                }
                printf("Mouse button %d has been %s\n",
                       events[i].button.button,
                       (events[i].button.state == SDL_PRESSED) ?
                       "pressed" : "released");
                break;
                /* Show relative mouse motion */
            case SDL_MOUSEMOTION:
                printf("Mouse relative motion: {%d,%d}\n",
                       events[i].motion.xrel, events[i].motion.yrel);
                break;
            }
        }
        /* Give up some CPU to allow events to arrive */
        SDL_Delay(20);
    }
    return (0);
}

int SDLCALL
HandleKeyboard(void *unused)
{
    SDL_Event events[10];
    int i, found;

    /* Handle mouse events here */
    while (!done) {
        found = SDL_PeepEvents(events, 10, SDL_GETEVENT, SDL_KEYDOWN, SDL_KEYUP);
        for (i = 0; i < found; ++i) {
            switch (events[i].type) {
                /* We want to toggle visibility on buttonpress */
            case SDL_KEYDOWN:
            case SDL_KEYUP:
                printf("Key '%c' (keysym==%d) has been %s\n",
                       events[i].key.keysym.unicode,
                       (int) events[i].key.keysym.sym,
                       (events[i].key.state == SDL_PRESSED) ?
                       "pressed" : "released");

                /* Allow hitting <ESC> to quit the app */
                if (events[i].key.keysym.sym == SDLK_ESCAPE) {
                    done = 1;
                }

                /* skip events now that aren't KEYUPs... */
                if (events[i].key.state == SDL_PRESSED)
                    break;

                if (events[i].key.keysym.sym == SDLK_f) {
                    int rc = 0;
                    printf("attempting to toggle fullscreen...\n");
                    rc = SDL_WM_ToggleFullScreen(SDL_GetVideoSurface());
                    printf("SDL_WM_ToggleFullScreen returned %d.\n", rc);
                }

                if (events[i].key.keysym.sym == SDLK_g) {
                    SDL_GrabMode m;
                    m = SDL_WM_GrabInput(SDL_GRAB_QUERY) ==
                        SDL_GRAB_ON ? SDL_GRAB_OFF : SDL_GRAB_ON;
                    printf
                        ("attempting to toggle input grab to %s...\n",
                         m == SDL_GRAB_ON ? "ON" : "OFF");
                    SDL_WM_GrabInput(m);
                    printf("attempt finished.\n");
                }

                break;
            }
        }
        /* Give up some CPU to allow events to arrive */
        SDL_Delay(20);
    }
    return (0);
}

int
main(int argc, char *argv[])
{
    SDL_Surface *screen;
    SDL_Surface *icon;
    Uint8 *icon_mask;
    int i, parsed;
    Uint8 *buffer;
    SDL_Color palette[256];
    Uint32 init_flags;
    Uint8 video_bpp;
    Uint32 video_flags;
    SDL_Thread *mouse_thread;
    SDL_Thread *keybd_thread;

    /* Set the options, based on command line arguments */
    init_flags = SDL_INIT_VIDEO;
    video_bpp = 8;
    video_flags = SDL_SWSURFACE;
    parsed = 1;
    while (parsed) {
        if ((argc >= 2) && (strcmp(argv[1], "-fullscreen") == 0)) {
            video_flags |= SDL_FULLSCREEN;
            argc -= 1;
            argv += 1;
        } else if ((argc >= 3) && (strcmp(argv[1], "-bpp") == 0)) {
            video_bpp = atoi(argv[2]);
            argc -= 2;
            argv += 2;
        } else {
            parsed = 0;
        }
    }

    /* Initialize SDL with the requested flags */
    if (SDL_Init(init_flags) < 0) {
        fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());
        return (1);
    }

    /* Set the icon -- this must be done before the first mode set */
    icon = LoadIconSurface("icon.bmp", &icon_mask);
    if (icon != NULL) {
        SDL_WM_SetIcon(icon, icon_mask);
    }
    if (icon_mask != NULL)
        free(icon_mask);

    /* Initialize the display */
    screen = SDL_SetVideoMode(640, 480, video_bpp, video_flags);
    if (screen == NULL) {
        fprintf(stderr, "Couldn't set 640x480x%d video mode: %s\n",
                video_bpp, SDL_GetError());
        quit(1);
    }
    printf("Running in %s mode\n", screen->flags & SDL_FULLSCREEN ?
           "fullscreen" : "windowed");

    /* Enable printable characters */
    SDL_EnableUNICODE(1);

    /* Set an event filter that discards everything but QUIT */
    SDL_SetEventFilter(FilterEvents, NULL);

    /* Create the event handling threads */
    mouse_thread = SDL_CreateThread(HandleMouse, "MouseHandler", NULL);
    keybd_thread = SDL_CreateThread(HandleKeyboard, "KeyboardHandler", NULL);

    /* Set the surface pixels and refresh! */
    for (i = 0; i < 256; ++i) {
        palette[i].r = 255 - i;
        palette[i].g = 255 - i;
        palette[i].b = 255 - i;
    }
    SDL_SetColors(screen, palette, 0, 256);
    if (SDL_LockSurface(screen) < 0) {
        fprintf(stderr, "Couldn't lock display surface: %s\n",
                SDL_GetError());
        quit(2);
    }
    buffer = (Uint8 *) screen->pixels;
    for (i = 0; i < screen->h; ++i) {
        memset(buffer, (i * 255) / screen->h,
               screen->w * screen->format->BytesPerPixel);
        buffer += screen->pitch;
    }
    SDL_UnlockSurface(screen);
    SDL_UpdateRect(screen, 0, 0, 0, 0);

    /* Loop, waiting for QUIT */
    while (!done) {
        SDL_PumpEvents();

        if (SDL_PeepEvents(NULL, 0, SDL_PEEKEVENT, SDL_QUIT, SDL_QUIT)) {
            done = 1;
        }
        /* Give up some CPU so the events can accumulate */
        SDL_Delay(20);
    }
    SDL_WaitThread(mouse_thread, NULL);
    SDL_WaitThread(keybd_thread, NULL);
    SDL_Quit();
    return (0);
}
